How is the existence of Earth's unique atmosphere explained?
A) The oxygen in Earth's atmosphere is a result of early life on Earth.
B) Volcanic gases containing nitrogen were outgassed from Earth's interior.
C) As Earth cooled, water vapor fell out of the atmosphere to form the oceans.
D) Ultraviolet radiation from the Sun freed the hydrogen, allowing it to escape.
E) When Earth formed, its atmosphere formed from the gases most common in the early solar system.
A
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Which of the following is believed to have played a major role in the condensation process predicted by the condensation theory?
a. Dust b. Temperature c. Retrograde motion d. Protosuns
Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
What will be an ideal response?
If a force accelerates 4.5 kg at 40. m/s2, that same force would accelerate 18. kg by how much?
A) 0.18 km/s2 B) 40. m/s2 C) 10. m/s2 D) 32. ft/s2 E) 0.16 km/s2
How many calories are equal to four BTU? (One calorie = 4.186 J, one BTU = 1 054 J.)
a. 1.007 b. 15.89 c. 1007 d. 1589